Hetjerqcycuc compounds and process



United States Patent- C HIQTERQCYCLIC.COMPOUNDSANDPBOQEfi OEPRODUClbIGTHEMT Julius. Diamond, Philadelphia, and William Bruce,

Havertown; Pm, assignors toAmerican Home -Products Corporation, New York, N. Y., a corporation lof D ela ware Application December 23; 1953,; Serial No.400,136

7 Claims. c1. 260- 239 ume Thisinvention; relates to heterocyclic compounds @and moi"egiparticularly involves azacycloalkanes and; the-meth; ochfor preparing them.

-Basic compounds falling Within the scope ;of :the; inventi onv may be represented by the general vformula CH CH C 2 with; R standing for an alkyl radical or hyd r ogen and A representing an anion.

These compounds are capable of f rrningacid-addition salts with organic or inorganic acids most of which arejj of solid or crystalline nature. In addition, the free bases may be reacted with alkyl halides on an equimolar basis, forming quaternary ammonium compounds. The compounds have been found useful either'for the preparation of surface active agents or as therapeutic agents demonstrating an analgesic action.

In the preparation of any of the above-described bases, one may; start; with the correspondingA-cyan compound disclosed and claimed in a prior co-pendingappl' on; Serial No. 297,185 filed July 3, 1952, .now Patent Nt. 2,666,050; By one procedure, a 4-aryl-4-cyano-azacyeloheptalne is, heated with an alkali-metal amide-,sucheas sodium, potassium or lithium amide in the presence of arrinert organic solvent of the aliphatic type such't ras hexane or higher, or of the benzenoid type SUCh $,;-b!l zene toluene or Xylene. The reaction will take; place inthe range of about 50 to about 150 C. A preferable temperature range of operation is in 90 to 110 C.

Another procedure for preparing the azacycloheptanes involves hydrolyzing the corresponding cyano. compound to form the 4eamido-azacycloheptane, and then reacting the latter compound with an alkali metal hydroxide which forms first the carboxylic acid salt of the alkali metal'followed by a decarboxylationto the desired compound. This stepwiseprocedure is carried out first .at about l90 t e e q lho d' for the formation of the amide, with fwteng p attire 2,740,778 arasite 1.. 2 a

beinggaised in; the neighborhood o f about 250i" C. for tlie fihal step's." If only 'tli final produ ct is sought, with no desire to separate out intermediate compounds; the reaction may be carriedout-*bymerely heating the cyano compound with th hydroxide andwater between about 3:00? C. l 1 t I .1 i i The amide in ,r atire yi pure fortn may reagingthe 4-cyano'bas'ej wiith'a hi a suehias IKOH at a ltempratilre i w s n alcohols as able' forithereactiontf Of coui rie hyl c lmayj eus pifon mig ates In for den to o'btaidca I mpoun d'sf, the: above procedure may be followed but operating 'a'tia tempera: ture above 160 C., namely, in the neighborhoodof 200;, Q t

het pee fi example lus t tezsimsreater detailet ode forobtaining typical compoundsaof g-the ;inyention.1

Example 1- 13 1111139113 011 0.05 rnole (lQ.7 g.)-A;cyano l-methyl-4 phenylazacycloheptane and 0.11 mole L (4.3 g.) sodamide iri ,100 ml. of toluene was refluxed: while stirring for 6 hours The cooled: mixture was washed withtwater, then the toluene layer extractedjavith;,acid; the acid:e xtract washed with ether, treatedi with sodium, hydroxide and cnon p roduct eatraqt dywith ether, The ether, errtract was dried, filtered and distilled, The product l-. methyl-4-phenyl-azacycloheptane was collected at 88-90 C. (0.25 mm); 11 115288; Analysis.-Calcd. for lufitslig 2- 25, a 30-. qun 82.20H; 10311; b1 751 aza'cyeloheptane isqpropiod,ide v V obvious thatjother 'salts, as w ,l l"as,quaternary ammoni m compoundsj' may,bejprep 'd y following} the above procedures; Thusgb'esides the salts 'ntentionfed, one may prepare the correspqnding salts by reacting thefree base with hydrogen bromide;"sulfuric acid, nitric acid, P1 2512ho ic.ac dv .or ot e inorganictacids h :.Well as :the loyver aliphatie' acids (such ,as acet ic;pacid,?,propionic :acid; lac ti acid, etc. With regard;to,r other,,quaternaityzsaltsj l w yl l l iies v may be used of., the ;lower and, higher. type "such as lanry l bromide; or;;chlorid.e where-a longchain alltyl group is desired onthe. base moiety;..

Example 2 In the sameman ner as taughtyin Example,1, and start: ing with 0:05. "mp1s (11.4. g.) of,L4ecyano-l ,2edirnethyl 4-- hfinylazacycloheptane',t One maynbtaia the free, base 1,2-t ime hY 4- ny azacyclohe ane, B. L P; 106- 108? to.

3 C, 82.65; H, 10.40; N, 6.88. Found: C, 82.25; H, 10.35; N, 6.66.

The picrate, M. P. 128-130 C., was prepared in methanol-ether. Analysis.-Calcd. for CzoHzrNrOq: C, 55.60; H, 5.59; N, 12.95. Found: C, 55.35; H, 5.58; N, 12.70.

Example 3 Following the procedure of Example 1, and starting with 0.05 mole (11.4 g.) 4-cyano-1,3-dimethyl-4-phenylazacycloheptane, the product obtained is 1,3-dimethyl-4- phenylazacycloheptane, B. P. 98-100 C. (0.25 mm.), 12 1.5251. Analysis.-Calcd. for C14H21N: C, 82.65; H, 10.40; N, 6.88. Found: C, 82.06; H, 10.35; N, 6.60.

The methiodide, M. P. 184-190 C., was prepared in acetone. Analysis.-Calcd. for C15H24NI: C, 52.20; H, 7.00; N, 4.06; I, 36.75. Found: C, 51.86; H, 7.14; N, 3.72; I, 36.4.

Example 4 A mixture of 0.03 mole (6.4 g.) 4-cyano-1-methyl-4- phenylazacycloheptane, 0.12 mole (6.8 g.) potassium hydroxide, and 0.06 mole (1.1 g.) water was heated in an air bath at ZOO-300 C. under partial vacuum (ca. 200 mm.) for 45 minutes. The crude product was distilled directly from the mixture at 15-20 mm. On redistillation, 1-methyl-4-phenylazacycloheptane was obtained, B. P. 92-94 C. (0.3 mm.), 11 1.5301. The picrate, M. P. 148-149 C., was prepared in methanol and recrystallized from aqueous acetic acid. No depression in melting point was observed on admixing with the picrate of the product obtained by Example 1.

Example 5 A mixture of 0.715 mole (153 g.) of 4-cyano-4-phenyl- 1-methyl-azacycloheptane, 1.43 mole (25.7 g.) of water, and 2.86 mole (160 g.) of potassium hydroxide was heated in an air-bath while continuously stirring under 300 mm. pressure. A maximum temperature of 207 C. was reached after 30 minutes and then the temperature was maintained at 195-205 C. for an additional 30 minutes. An upper oil layer was present. The mixture was cooled to room temperature whereupon the oily layer solidified. It was filtered and the solid (A) washed several times with cold water; M. P. 80-85 C.

The filtrate from (A) was extracted with ether, the extract dried, filtered, and concentrated. Trituration of the liquid residue with n-hexane precipitated solid (B); M. P. 89-91 C.

(A) and (B) were combined, ground under n-hexane containing some benzene, then filtered to give an almost white solid (C) of 4-carbamyl-4-phenyl-1-methylazacycloheptane monohydrate, M. P. 90-92 C. This material did not depress the melting point of an authentic sample of the amide monohydrate prepared by the method of Example 6.

The combined n-hexane filtrates obtained from (B) and (C) were concentrated and the liquid residue distilled. At 90-95 C. (0.3 mm.) 22.5 g. (16.7%) of 4-phenyl-1- methylazacycloheptane was obtained, n 1.5300, as by-product.

Example 6 A mixture of 0.030 mole (6.4 g.) of 4-cyano-4-phenyll-methyl-azacycloheptanewas dissolved in 75 ml. of heptanol-Z containing 0.035 mole (2.0 g.) of potassium hydroxide. The solution was heated to its reflux temperature (157-160 C.) with stirring for 2 hours. The cold mixture was extracted with acid, the acid extract washed with ether, reacted with sodium hydroxide, and ether extracted. The ether extract was dried, filtered, and concentrated. A liquid residue was obtained which began to crystallize after standing overnight. Trituration with nhexane hastened the crystallization. The white crystals were filtered off and washed with n-hexane to give 4-carbamyl-4-phenyl-1-methyl-azacycloheptane monohydrate,

4 M. P. -96 C. Analysis.Calcd. for C14H20N2O'H2O: C, 67.15; H, 8.86; N, 11.20. Found: C, 67.11; H, 8.87; N, 10.76.

Example 7 Dissolve .03 mole of cyano base in .06 mole of KOH in about ml. methanol. The material is heated in the neighborhood of 200 C. under pressure. The mixture is cooled and reacted with .03 mole of concentrated sulfuric acid. Potassium sulfate precipitates and is filtered off. To the filtrate is added .015 mole of sulfuric acid and the solution is concentrated to a small volume. It is then diluted with acetone and the sulfate salt of 4-carboxy-4- phenyl-l-methylazacycloheptane crystallizes out; M. P. 250-251 C. (with decomp.). Analysis.-Calcd. for C14H19NO2- /2H2SO4: C, 59.52; H, 7.14; N, 4.96; S, 5.68. Found: C, 59.27; H, 7.30; N, 5.00; S, 5.30.

The above-described compounds are useful for the preparation of other cyclic compounds having special functional groups in the 4-position besides the aryl group. Thus, these compounds, and particularly the compound prepared as described in Example 3, when reacted with lead tetra-acetate or higher aliphatic acid salt at about 100 C. in the presence of acetic acid or higher corresponding carboxylic acid will result in the addition of an acyloxy radical in the 4-position of the ring. Compounds of this type have also been found to demonstrate an analgesic action besides having usefulness in the manner described previously.

We claim:

1. The process comprising decyanating a compound having the formula ON R:

CHz-CHrCHg wherein R1 stands for a lower alkyl While R2 and R3 each represent a member of the group consisting of hydrogen and lower alkyl and salts thereof.

3. The compound 4-phenyl-1-methyl-azacycloheptane.

4. The compound 1,2-di-lower alkyl-4-phenyl-azacycloheptane. v

5. The compound 1,3-di-lower alkyl-4-phenyl-azacycloheptane.

6. The compound 1,2-dimethyl-4-phenyl-azacycloheptane.

7. The compound 1,3-dimethyl-4-phenyl-azacycloheptane.

References Cited in the file of this patent UNITED STATES PATENTS Diamond et al Jan. 12, 1954 OTHER REFERENCES Gabriel: Chem. Abst., vol. 3, p. 2138 (1909). Karrer: Org. Chem. (Elsevier), p. 178 (1946). 

2. A COMPOUND OF THE GROUP CONSISTING OF AN AZACYCLOHEPTANE BASE HAVING THE GENERAL FORMULA 